Code Quality: Update localization strings in action classes

[mrashutoshnigam]

Code Quality: Centralize and Refactor Localization Strings in Files App

This pull request aims to improve code quality and maintainability in the Files App by centralizing localization strings and replacing string literals with string constants. The changes enhance consistency, reduce the risk of typos, and streamline future updates and localization efforts.

Closes #16718

Changes Made

• Created a centralized Strings class to manage all localization strings.
• Refactored localization strings in the following actions:
  • DeleteItemAction
  • DeleteItemPermanentlyAction
  • EmptyRecycleBinAction
  • FlattenFolderAction
  • OpenFileLocationAction
  • OpenItemAction
  • OpenItemWithApplicationPickerAction
  • OpenParentFolderAction
• Updated labels and descriptions for improved user experience.
• Replaced string literals with corresponding string constants throughout the Files App codebase.
• Updated confirmation dialog content in EmptyRecycleBinAction and FlattenFolderAction.

Benefits

• Improved maintainability: All strings are now managed in one place.
• Enhanced consistency across the application.
• Reduced likelihood of typos and errors.
• Improved code readability.
• Streamlined future updates and localization efforts.

Testing Steps

1. Open Files App.
2. Check Right Click menu, focusing on the refactored actions (Delete, Empty Recycle Bin, Flatten Folder, etc.).
3. Perform actions that trigger string-dependent functionality, especially those with confirmation dialogs.
4. Update language via settings and repeat steps 2 and 3.
5. Verify that no visual or functional regressions occurred due to the changes.
6. Check for any compile-time errors or warnings related to string usage.

Additional Notes

• This change does not alter any functionality but improves code maintainability.
• Code reviewers should pay special attention to ensure no string literals were missed during this refactoring.
• Special focus should be given to the confirmation dialogs in EmptyRecycleBinAction and FlattenFolderAction to ensure they display correctly.

[yaira2]

LGTM